Split out from PR42336. But here's a C testcase where we lose debug info about a parameter that was optimized away: there are no formal parameters in the DWARF output for f.
int i; static int f(int) __attribute ((noinline)); static int f(int x) { return i; } int main() { return f(42); } -- Summary: [4.5 Regression] Wrong debug information with IPA-SRA Product: gcc Version: 4.5.0 Status: UNCONFIRMED Keywords: wrong-debug Severity: normal Priority: P3 Component: tree-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: rguenth at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43141